Have a 2010 Sundance Optima 880 spa (OXO3LCD-100378459-0710) giving me FLO2 error.
The controller is 6600284 Rev G
After dropping the curtain to look for the flow switch (and giving it 2 power cycles) it came back to life. When it wasn’t running, flow switch open—closed once flow resumed.
Ran spa for about an hour and all was well. After putting the right hand panel with the radio back together, I found the radio was not working.
Went to track down 12 v but dinner was calling so I buttoned it up.
Went back today to work on radio and FLO2 error was back.
Opened up controller and found 30 a fuse holder charred on one end but was still passing voltage.
Not wanting to add another problem should I break it, I left it for later.
I found 120v on the white conductor going to the circulating pump and 120 v on the black wire coming from the terminal strip TB 404-10. Bad circulating pump?
Went back to the 30 a bakelite fuse holder and popped the fuse. The feed side of the holder was melted and the retaining screw for the clip was partially pulled out and frozen in the melted bakelite. Should probably replace it once everything is back.
Cleaned the fuse and the spring clips—couldn’t re-install the torq holding screw for the spring clip.
So—possibly bad circulating pump? Bad 12v supply for radio?
I figure you probably have a little more experience with thing than I . Thanks!